The action of o‐, m‐, and p‐isomers of disubstituted benzene derivatives on soap coacervates depends inter alia on the interaction of the groups. With benzene derivatives with a hydrophilic “anchor” group and a hydro‐phobic second substituent we find the series p > m > o. When the second substituent is a chlorine atom the same series appears in some cases, in other cases (e.g. chloroanilines) the sequence is reversed. Then it appears that the second group possesses a more hydrophilic character. The “anchor” group is in this case an electron donor, while the chlorine atom is electron attracting. The action of other isomeric benzene derivatives may be explained from the same point of view.